Rollup merge of rust-lang#90771 - asterycs:fix/trait-object-error-code, r=michaelwoerister

Fix trait object error code

closes rust-lang#90768

I `grep`:d and changed the occurrences that seemed relevant. Please let me know what you think and if anything is missing!

Author: hellow554

compiler/rustc_typeck/src/check/fn_ctxt/_impl.rs

@@ -952,7 +952,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     let mut err = rustc_errors::struct_span_err!(
                         self.sess(),
                         self_ty.span,
-                        E0783,
+                        E0782,
                         "{}",
                         msg,
                     );

src/test/ui/editions/dyn-trait-sugg-2021.stderr

@@ -1,9 +1,9 @@
-error[E0783]: trait objects without an explicit `dyn` are deprecated
+error[E0782]: trait objects without an explicit `dyn` are deprecated
   --> $DIR/dyn-trait-sugg-2021.rs:10:5
    |
 LL |     Foo::hi(123);
    |     ^^^ help: use `dyn`: `<dyn Foo>`
 
 error: aborting due to previous error
 
-For more information about this error, try `rustc --explain E0783`.
+For more information about this error, try `rustc --explain E0782`.